I'm based in the UK and am using a DIR-655 router but I have no record of its serial number (there is no sticker on the item, and the original box is now missing) - is there any way I can ascertain which version of the router I have? As I understand matters, I need to know this so that I can apply the correct firmware upgrade, which is what I wish to do. Any help will be gratefully received! Thanks in advance Alan W